sounds fun, until you see what the total cost will be in terms of food, clean water, or equipment to filter, heat, and pump all that water. Alot of the aquaculture areas are close to the sea or a reliable source of water. Also, lot of profitable aquaculture businesses are either over seas, or in valuable food fish like salmon, trout, or catfish. There is also profitable crustacean or mollusk farming like shrimp farming in Bangladesh, or pearl oysters in Japan, etc. But, i did hear that if you can raise lobsters in volume, then you probably can make some money in that but the problems with lobsters are that they are cannibals to each other.